MDPT-20-4-X-T Optical Gigabit Ethernet
Dual Port LC Transceiver ---- 1.25GBaud
FEATURES
®
ORDERING INFORMATION
MDPT- 20 - 4 - X - T
Optoelectronic Products
7444 West Wilson Avenue • Chicago, IL 60656
708/867-9600 • 800/323-6858 • Fax: 708/867-0996
email:optoinfo@methode.com
http://www.methode.com
For intermediate and long reach data links, the MDPT-20-
4-2-T with single mode optics can extend the interconnect
distance in excess of 20km.
MODULE SPECIFICATIONS - ABSOLUTE MAXIMUM RATINGS
PARAMETER
Storage Temperature
Soldering Temperature
Supply Voltage
Data AC Voltage
Data DC Voltage
SYMBOL
Tstg
V cc
Tx+, Tx-
Tx+, Tx-
MIN
-40
MAX
85
260
6.0
2.6
10
UNITS
°C
°C
V
V pp
V pk
NOTES
10 seconds on leads only
Vcc - ground
Differential
V (Tx+ or Tx-) - ground
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RX_LOS SIGNAL
T
- TTL Output
WAVELENGTH
1
- 850 nm (multimode)
2 - 1300nm (single mode) 5km
2M - 1300nm (single mode) 10km
2L - 1300nm (single mode) 20km
COMMUNICATIONS PROTOCOL
4 - Gigabit Ethernet, 1.25GBaud
6
- Fibre Channel, 1.0625GBaud
n
Compliant with IEEE 802.3z 1000BASE-LX and
1000BASE-SX
n
Hot pluggable
n
Industry's lowest In-Rush current
n
Double Density of present GBIC
n
Dual port LC transceivers
n
75Ω AC coupled PECL transmission lines
n
Maintains standard GBIC SCA-2 electrical connector
n
Maintains standard GBIC panel cutouts
n
Maintains standard GBIC release levers
n
Keyed rail systems prevents accidental insertion of
dual port transceiver into standard GBIC receptacle.
n
Serial ID functionality
n
Class 1 Laser Safety Compliant
n
UL 1950 approved
PRODUCT OVERVIEW
The MDPT-20-4-X-T Dual Port optical transceivers are high
performance integrated duplex data links for bi-directional
communication over multimode and single mode optical
fiber. The MDPT-20-4 module is specifically designed to
be used in Gigabit Ethernet applications. The MDPT-20-4
transceivers are provided with the LC receptacle
compatible with the industry standard LC connector plug.
These transceivers provide double port densities by fitting
twice the number of transceivers into the same board
space as a standard GBIC form factor. This saves on
system costs and can reduce overall design time.
This dual optoelectronic transceiver module is a class 1
laser product compliant with FDA Radiation Performance
Standards, 21 CFR Subchapter J. This component is also
class 1 laser compliant according to International Safety
Standard IEC-825-1.
SHORT WAVELENGTH LASER
The use of short wavelength VCSELs (Vertical Cavity
Surface-Emitting Laser) and high volume production
processes has resulted in a low cost, high performance
product available in various data transfer rates up to 1.25
GBaud.
LONGWAVELENGTH LASER
-10
®
MDPT-20-4-X-T Optical Gigabit Ethernet
Dual Port LC Transceiver ---- 1.25GBaud
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Ambient Operating Temperature
Supply Voltage
Baud Rate
SYMBOL
Ta
V cc
BRate
MIN
0
4.75
TYP
5.00
1.25
MAX
70
5.25
UNITS
°C
VD C
GBaud
NOTES
±100ppm
Ta = 25° C, Vcc = 5.0 V
Supply Current
In-rush current
TRANSMITTER
ECL Input (Single Ended)
ECL Input (Differential)
Input Impedance
TX_DISABLE Input - Low
RECEIVER
TX_DISABLE Input - High
ECL Output (Single Ended)
ECL Output (Differential)
Total Jitter
TTL RX_LOS Output - Low
TTL RX_LOS Output - High
PERFORMANCE SPECIFICATIONS - OPTICAL 850 nm Laser Multimode
PARAMETER
FIBER LENGTH
50 µm Core Diameter MMF
62.5 µm Core Diameter MMF
TRANSMITTER
Optical Transmit Power
Optical Center
Spectral Width
Extinction Ratio
Relative Intensity Noise
Total Jitter
Output Rise, Fall Time
RECEIVER
Optical Input
Optical Input Power
Optical Return Loss
RX_LOS - Asserted
RX_LOS - Deasserted
RX_LOS - Hysteresis
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lcc
300
375
60
mA
Ta = 25°C, Vcc = 5.0 V
lcc
400
mA
mA
350
720
75
1250
mVpp
ohms
V
AC coupled inputs
700
0
1440
2500
0.8
mVpp
AC coupled inputs
Zin
Rin > 100 kohms @ DC
2.0
V
DD
T+0.3 V
930
300
600
750
mVpp
mVpp
AC coupled outputs
AC coupled outputs
1500
1860
266
0.5
TJ
p se c
V
V
2.4
3.0
MODULE SPECIFICATIONS - ELECTRICAL
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
0° C <Ta< 70°C, 4.5 V< Vcc <5.5 V
current above steady state value
I
OL
= -1.6 mA, 1 TTL Unit Load
I
OH
= 40µA, 1 TTL Unit Load
Ta = 25° C, Vcc = 5.0 V
SYMBOL
MIN
550
300
-10
830
9
TYP
750
400
MAX
UNITS
m
m
NOTES
BER < 1.0E-12 @ 1.25 GBaud
BER < 1.0E-12 @ 1.25 GBaud
average @ 850 nm
RMS
P opt
λ
∆λ
ER
RIN
TJ
850
10
-4
860
.85
dB m
nm
nm
150
-117
227
260
dB
dB/Hz
p se c
P1/P0
t
R
, t
F
p se c
20 - 80% values, measured unfiltered
λ
Pr
ORL
Pa
Pd
Pa - Pd
770
-17
12
-29
860
0
nm
-20
30
1.5
-17
5.0
dB m
dB
dB m
dB m
dB
BER < 1.0E-12
measured on transition - low to high
measured on transition - high to low
®
MDPT-20-4-X-T Optical Gigabit Ethernet
Dual Port LC Transceiver ---- 1.25GBaud
MLC-25-4-2-T PERFORMANCE SPECIFICATIONS - OPTICAL
PARAMETER
FIBER LENGTH
9.0 µm Core Diameter SMF
TRANSMITTER
Optical Center
RMS Spectral Width
Optical Transmit Power
RECEIVER
Optical Input Power
Optical Center
Optical Return Loss
RX_LOS - Asserted
RX_LOS - Deasserted
RX_LOS - Hysteresis
SYMBOL
MIN
5
λ
∆λ
P opt
1270
-12
TYP
10
1310
1355
4
-3
MAX
UNITS
km
nm
nm
dB m
NOTES
BER < 1.0E-12 @ 1.25 GBaud
Ta=25°C, Vcc=5.0V
MLC-25-4-2M-T PERFORMANCE SPECIFICATIONS - OPTICAL
PARAMETER
FIBER LENGTH
9.0 µm Core Diameter SMF
TRANSMITTER
Optical Center
RMS Spectral Width
Optical Transmit Power
RECEIVER
Optical Input Power
Optical Center
Optical Return Loss
RX_LOS - Asserted
RX_LOS - Deasserted
RX_LOS - Hysteresis
SYMBOL
MIN
10
TYP
20
MLC-25-4-2L-T PERFORMANCE SPECIFICATIONS - OPTICAL
PARAMETER
FIBER LENGTH
9.0 µm Core Diameter SMF
TRANSMITTER
Optical Center
RMS Spectral Width
Optical Transmit Power
RECEIVER
Optical Input Power
Optical Center
Optical Return Loss
RX_LOS - Asserted
RX_LOS - Deasserted
RX_LOS - Hysteresis
SYMBOL
MIN
20
TYP
25
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RMS
average @ 1310 nm
Pr
λ
ORL
Pa
Pd
Pa - Pd
-20
1270
12
-29
1310
30
-3
1355
1.5
-20
5.0
dB m
nm
dB
dB m
dB m
dB
MAX
UNITS
km
NOTES
λ
∆λ
P opt
1285
-9.5
1310
1335
3
-3
nm
nm
dB m
RMS
average @ 1310 nm
Pr
λ
ORL
Pa
Pd
Pa - Pd
-20
1270
12
-29
1310
30
-3
1355
1.5
-20
5.0
dB m
nm
dB
dB m
dB m
dB
MAX
UNITS
km
NOTES
λ
∆λ
P opt
1300
-7
1310
1320
2
-3
nm
nm
dB m
RMS
average @ 1310 nm
Pr
λ
ORL
Pa
Pd
Pa - Pd
-22
1300
12
-29
1310
30
-3
1320
1.5
-22
5.0
dB m
nm
dB
dB m
dB m
dB
average power for BER < 1.0E-12
measured on transition - low to high
measured on transition - high to low
Ta=25°C, Vcc=5.0V
BER < 1.0E-12 @ 1.25 GBaud
average power for BER < 1.0E-12
measured on transition - low to high
measured on transition - high to low
Ta=25°C, Vcc=5.0V
BER < 1.0E-12 @ 1.25 GBaud
average power for BER < 1.0E-12
measured on transition - low to high
measured on transition - high to low
®
MDPT-20-4-X-T Optical Gigabit Ethernet
Dual Port LC Transceiver ---- 1.25GBaud
TERMINATION CIRCUITS
Inputs to the MDPT-20 transmitter are AC coupled and internally terminated through 75 ohms to AC ground. These
transceivers can operate with PECL or ECL logic levels. The input signal must have at least a 0.35 V peak-to-peak
(single ended) signal swing. Output from the receiver section of the module is also AC coupled and is expected to drive
into a 75 ohm load. Different termination strategies may be required depending on the particular Serializer/Deserializer
chip set used.
Subsequently, this affords the customer the ability to optimally locate the SERDES as close to the MDPT-20 as pos-
sible and save valuable real estate on PCI cards and other small circuit assemblies. At gigabit rates this can provide a
significant advantage resulting in better transmission performance and accordingly better signal integrity.
AC coupling allows the Methode MDPT-20 to be applied across a wider range of applications without modification. This
benefits users in terms of enhanced RF performance, reduced component count, tighter layout and fewer design prob-
lems.
Additional DC blocking capacitors on transceiver "B" are necessary to prevent shorting to ground the channel "B"
SERDES I/O when a standard GBIC is inserted into the dual port receptacle [see note 3 on following page}.
Figure 1 (following page) illustrates the recommended transmit and receive data line terminations
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Close positioning of SERDES with respect to transceiver; allows for shorter line lengths and at
The MDPT-20 product family is designed with AC coupled data inputs and outputs to provide the following advantages:
gigabit speeds reduces EMI.
n
Minimum number of external components.
n
Internal termination reduces the potential for unterminated stubs which would otherwise increase
jitter and reduce transmission margin.
Optoelectronic Products
7444 West Wilson Avenue • Chicago, IL 60656
708/867-9600 • 800/323-6858 • Fax: 708/867-0996
email:optoinfo@methode.com
http://www.methode.com
®
MDPT-20-4-X-T Optical Gigabit Ethernet
Dual Port LC Transceiver ---- 1.25GBaud
Notes:
1. Consult the SERDES manufacturer’s applications information for biasing required for Tx outputs. Some serializer outputs are
internally biased and may not need external bias resistors.
2. Consult SERDES manufacturer’s data sheet and application data for appropriate receiver input biasing network.
3. The recommended data terminations allows the host to insert a standard GBIC into a PCB designed for a dual port transceiver.
The 0.1µF capacitors on the data lines of transceiver "B" are GND blocking capacitors when a standard single port GBIC is
inserted into a MDPT-20 port. They prevent the I/O data lines from being shorted to GND.
4. In the MDPT-20, this pin is not electrically connected. When a standard single port GBIC is inserted into MDPT-20 port, the pin
will appear as TX_FAULT. The host should connect this pin according to their application.
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FIGURE 1: Recommended TRANSMIT and RECEIVE Data Terminations
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